<template>
    <div class="search-menu">
        <i :class="'iconfont icon-sousuo'" class="toolBar-icon" @click="handleOpen"></i>
        <el-dialog
            class="search-dialog"
            v-model="isShowSearch"
            :width="600"
            :show-close="false"
            top="10vh"
        >
            <el-input
                v-model="searchMenu"
                ref="menuInputRef"
                placeholder="菜单搜索：支持菜单名称、路径"
                size="large"
                clearable
                :prefix-icon="Search"
            ></el-input>
            <div v-if="searchList.length" class="menu-list" ref="menuListRef">
                <div
                    v-for="item in searchList"
                    :key="item.path"
                    :class="['menu-item', { 'menu-active': item.path === activePath }]"
                    @mouseenter="mouseoverMenuItem(item)"
                    @click="handleClickMenu()"
                >
                    <div class="menu-lf">
                        <el-icon class="menu-icon">
                            <component :is="item.meta.icon"></component>
                        </el-icon>
                        <span class="menu-title">{{ item.meta.title }}</span>
                    </div>
                    <i :class="'iconfont icon-huiche'" class="menu-enter" @click="handleOpen"></i>
                </div>
            </div>
            <el-empty v-else class="mt20 mb20" :image-size="100" description="暂无菜单" />
        </el-dialog>
    </div>
</template>

<script setup >
import { ref, computed, nextTick, watch } from "vue"
// import { InputInstance } from "element-plus"
import { Search } from "@element-plus/icons-vue"
import { useAuthStore } from "@/store/modules/auth"
import { useRouter } from "vue-router"
import { useDebounceFn } from "@vueuse/core"

const router = useRouter()
const authStore = useAuthStore()
const menuList = computed(() => authStore.flatMenuListGet.filter(item => !item.meta.isHide))

const activePath = ref("")
const mouseoverMenuItem = (menu) => {
    activePath.value = menu.path
}

const menuInputRef = ref(null)
const isShowSearch = ref(false)
const searchMenu = ref("")

watch(isShowSearch, val => {
    if (val) {
        document.addEventListener("keydown", keyboardOperation)
    } else {
        document.removeEventListener("keydown", keyboardOperation)
    }
})

const handleOpen = () => {
    isShowSearch.value = true
    nextTick(() => {
        setTimeout(() => {
            menuInputRef.value?.focus()
        })
    })
}

const searchList = ref([])
const updateSearchList = () => {
    searchList.value = searchMenu.value
        ? menuList.value.filter(
            item =>
                (item.path.toLowerCase().includes(searchMenu.value.toLowerCase()) ||
                    item.meta.title.toLowerCase().includes(searchMenu.value.toLowerCase())) &&
                !item.meta?.isHide
        )
        : []
    activePath.value = searchList.value.length ? searchList.value[0].path : ""
}

const debouncedUpdateSearchList = useDebounceFn(updateSearchList, 300)

watch(searchMenu, debouncedUpdateSearchList)

const menuListRef = ref(null)
const keyPressUpOrDown = (direction) => {
    const length = searchList.value.length
    if (length === 0) return
    const index = searchList.value.findIndex(item => item.path === activePath.value)
    const newIndex = (index + direction + length) % length
    activePath.value = searchList.value[newIndex].path
    nextTick(() => {
        if (!menuListRef.value?.firstElementChild) return
        const menuItemHeight = menuListRef.value.firstElementChild.clientHeight + 12 || 0
        menuListRef.value.scrollTop = newIndex * menuItemHeight
    })
}

const keyboardOperation = (event) => {
    if (event.key === "ArrowUp") {
        event.preventDefault()
        keyPressUpOrDown(-1)
    } else if (event.key === "ArrowDown") {
        event.preventDefault()
        keyPressUpOrDown(1)
    } else if (event.key === "Enter") {
        event.preventDefault()
        handleClickMenu()
    }
}

const handleClickMenu = () => {
    const menu = searchList.value.find(item => item.path === activePath.value)
    if (!menu) return
    if (menu.meta?.isLink) window.open(menu.meta.isLink, "_blank")
    else router.push(menu.path)
    searchMenu.value = ""
    isShowSearch.value = false
};
</script>

<style scoped lang="scss">
.search-menu {
    :deep(.el-dialog) {
        border-radius: 4px;
        .el-dialog__header {
            display: none;
        }
    }
    .menu-list {
        max-height: 515px;
        margin-top: 15px;
        overflow: auto;
        .menu-item {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 45px;
            padding: 0 20px;
            margin: 10px 0;
            color: var(--el-text-color-secondary);
            cursor: pointer;
            background-color: transparent;
            border: 1px solid var(--el-border-color);
            border-radius: 6px;
            transition: all 0.2s ease;
            .menu-lf {
                display: flex;
                align-items: center;
            }
            .menu-icon {
                margin-right: 8px;
                font-size: 16px;
            }
            .menu-title {
                font-size: 14px;
            }
            .menu-enter {
                font-size: 17px;
            }
        }
        .menu-active {
            color: #ffffff;
            background-color: var(--el-color-primary);
            .menu-icon {
                font-size: 18px;
            }
            .menu-title {
                font-size: 16px;
            }
            .menu-enter {
                font-size: 19px;
            }
        }
    }
}
</style>
